Business and Basis of Presentation (Schedule of Deferred Policy Acquisition Costs) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
Deferred Policy Acquisition Cost [Line Items]
Balance	$ 7,097,511	$ 6,930,425	[1]	$ 7,029,308	$ 2,493,082	$ 2,493,082
As Originally Reported
Deferred Policy Acquisition Cost [Line Items]
Balance		6,616,097				2,433,936
Effect of Change
Deferred Policy Acquisition Cost [Line Items]
Balance		314,328			74,702
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Other					(15,556)
Term Life
Deferred Policy Acquisition Cost [Line Items]
Balance	743,888	648,837		577,084	462,099	462,099
Term Life | As Originally Reported
Deferred Policy Acquisition Cost [Line Items]
Balance						462,098
Term Life | Effect of Change
Deferred Policy Acquisition Cost [Line Items]
Balance					0
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Other					1
Variable / Universal Life
Deferred Policy Acquisition Cost [Line Items]
Balance	$ 2,897,925	$ 2,442,883		$ 2,561,011	2,030,983	2,030,983
Variable / Universal Life | As Originally Reported
Deferred Policy Acquisition Cost [Line Items]
Balance						$ 1,971,838
Variable / Universal Life | Effect of Change
Deferred Policy Acquisition Cost [Line Items]
Balance					74,702
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Other					$ (15,557)

[1] Prior period amounts reflect the implementation of Accounting Standard Update ("ASU") 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.